Tripartite entanglement from the cavity with second-order harmonic generation

Quadripartite entanglement from coupled type I second harmonic generation

“…Multicolored tripartite entangled states from cascaded nonlinear processes have been investigated by several groups [8][9][10][11][12]. Simpler schemes, where tripartite entanglement exists in the three output fields directly from above threshold optical parametric oscillator (OPO) [13] or type II SHG [14,15], have been predicted and experimentally confirmed [16]. Quadripartite entanglement generated from cascaded second-harmonic generation [17] and in an opto-mechanical system are also suggested [18].…”

Three-mode entanglement via atomic coherence induced by strong classical field

“…Using this criterion, a theoretical scheme for generating three-mode entangled states based on cascaded nonlinear processes was presented [34]. Zhai et al demonstrated that the optical cavity with second-order harmonic generation can produce three-mode entangled light beams when it operates below threshold [40]. Very recently, physicists have experimentally demonstrated the generation of CV multipartite entanglement among three bright beams of light, all of different wavelengths, in the system of an optical parametric oscillator [42].…”

“…Recently, with the development of multi-node quantum network technology, much attention has been paid on how to generate, detect and employ multipartite CV entanglement for quantum communication in various of linear optics and nonlinear optics systems [29][30][31][32][33][34][35][36][37][38][39][40][41][42]. For example, P. van Loock and Samuel L. Braunstein have investigated a truly multipartite entangled state generated by one single mode squeezed state distributed among N parties using linear optics [29].…”

Generation of bright three-color tripartite continuous variable entanglement via the sum-frequency generation

“…Grosse et al theoretically investigated [27] and experimentally proved [28] the perfect entanglement between the fundamental and the secondharmonic fields generated by the second-order nonlinear interaction. Moreover, there are several groups investigated type II SHG which can generate bipartite [29][30][31][32] and two-color tripartite [33,34] entanglement.…”